Ab initio configuration interaction calculations have been carried out on the potential energy surfaces of the ground and the doublet excited electronic states of CaOH. The calculated transition energies are in good agreement with previous theoretical values and with the available experimental data. The calculated Ca-O stretching potentials at different values of the bond angle show typical Rydberg minima at short internuclear distances but are complicated for large RCa-O. The calculated bending potentials are rather shallow for deviations of 5degrees-10degrees from linearity and, depending on the values of the Ca-O and O-H bond lengths, off-linear geometries have low energies. There is no evidence for the existence of an electronic state with bent equilibrium geometry, which would correspond to the reported state correlating with (F) over tilde (2)Pi of CaOH. The 7 (2)A' state (which does correlate with (F) over tilde (2)Pi) is found to be quasi-linear with a barrier to linearity of only 92 cm(-1), and similarly the 4 (2)A'' state (correlating with (C) over tilde (2)Delta) is found to be quasilinear with a barrier to linearity of 84 cm(-1).